fix(stt): honor Whisper provider proxy

[casama233]

Summary

• pass the configured provider proxy to the Whisper STT OpenAI client
• add regression coverage for proxy client construction

Testing

• python -m pytest -q /tmp/test_whisper_api_source.py

Summary by Sourcery

Route Whisper STT requests through the configured provider proxy.

Bug Fixes:

• Honor the configured provider proxy when constructing the Whisper STT OpenAI client.

Tests:

• Add regression coverage verifying the provider proxy is passed to the Whisper HTTP client.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Needs a human reviewer. The change routes Whisper audio through the configured proxy, so a faulty or unintended proxy can expose submitted audio or prevent transcription requests from reaching the provider. Reverting stops the new routing behavior, but cannot undo audio that was already sent through the wrong proxy.

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[casama233]

Superseded by # to comply with the repository branch and PR template conventions.

[casama233]

Superseded by #9777 to comply with the repository branch and PR template conventions.